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    <script>
        //Math   log12e ln12e pI sqrt1_2 1/2的平方根  sqrt 2 
        Math.max(154,56,45,4654,6);
        Math.min(0,-45,5);
        Math.round(123.12);
        Math.ceil(123.12);
        Math.floor(565.222);

        //什么sin cons tan asin...

        Math.random(max-min)+min;//[最大 到最小的范围]
        

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